package A20180305;

public class TestSimpleCircle {
	public static void main(String[] args) {
		SimpleCircle circle1 = new SimpleCircle();
		System.out.println("The area of the circle radius "
		   + circle1.radius + " is " + circle1.getArea());
		
		SimpleCircle circle2 = new SimpleCircle(25);
		System.out.println("The area of the circle of radius "
				+ circle2.radius + " is " + circle2.getArea());
		
		SimpleCircle circle3 = new SimpleCircle(125);
		System.out.println("The area of the circle radius "
				+ circle3.radius + " is " + circle3.getArea());
		
		circle2.radius = 100;
		System.out.println("The area of the circle of radius "
				+ circle2.radius + " is " + circle2.getArea());
	}
}

	class SimpleCircle {
		double radius;
		
		SimpleCircle() {
		 radius = 1;	
		}
		
		SimpleCircle(double newRadius) {
			radius = newRadius;
		}
		
		double getArea() {
			return radius * radius *Math.PI;
		}
		
		double getPerimeter() {
			return 2 * radius * Math.PI;
		}
		
		void setRadius(double newRadius) {
			radius = newRadius;
		}
	}

	
